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<h1>Air</h1>

<h2>External links</h2>
<ul>
<li><a href="http://aty.sdsu.edu/explain/atmos_refr/air_refr.html">Refractivity of air (by Andrew T. Young)</a></li>
<li><a href="http://emtoolbox.nist.gov/Wavelength/Ciddor.asp">NIST Refractive Index of Air Calculator (based on Ciddor equation)</a></li>
<li><a href="http://emtoolbox.nist.gov/Wavelength/Edlen.asp">NIST Refractive Index of Air Calculator (based on modified Edlén equation)</a></li>
<li><a href="https://en.wikipedia.org/wiki/Earth's_atmosphere">Earth's atmosphere - Wikipedia</a></li>
</ul>
